Discuz! Database Error

(1064) You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'and `first`=1' at line 1
SELECT * FROM forum_post WHERE tid= and `first`=1

PHP Debug

No.FileLineCode
1forum.php67require(%s)
2source/module/forum/forum_viewthread.php1008include(%s)
3data/template/12_diy_forum_viewthread.tpl.php2810discuz_database::fetch_first()
4source/class/discuz/discuz_database.php94discuz_database::query()
5source/class/discuz/discuz_database.php142db_driver_mysqli->query()
6source/class/db/db_driver_mysqli.php148db_driver_mysqli->halt()
7source/class/db/db_driver_mysqli.php223break()
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